What directly causes the pressure difference between the equator and the poles

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The primary factor that directly causes the pressure difference between the equator and the poles is the difference in temperature between these two regions. The equator receives more direct sunlight and therefore is warmer, leading to the air at the equator being heated and rising. This creates lower pressure at the equator. In contrast, the poles receive less sunlight and are therefore colder, causing the air at the poles to be denser and sink, creating higher pressure at the poles. This temperature difference and resulting difference in air density create the pressure gradient that drives atmospheric circulation and weather patterns.